9. shot (n.) a consecutive series of pictures that constitutes a unit of action in a film
The vacuum level is determined by the pressure differential between the evacuated volume and the surrounding atmosphere. Several units of measure can be used. Most refer to the height of a column of mercury â usually inches of mercury (in.-Hg) or millimeters of mercury (mm-Hg).
WARNING: and with atmospheric pressure. As an average, a compressor should pull a 20 to 22 vacuum against a 100 psig discharge pressure. When pumping against atmospheric pressure (with discharge shut-off valve closed and gauge port open to atmosphere), it should pull a 24 to 27 vacuum.